Design Of Programmable Microgirds Experimental Platform And Interface Passivation Of DC/DC Converters

With the deterioration of the global environment and the development of economy and society,the demand for energy is increasing,but the traditional fossil energy will gradually be exhausted.Thanks to environmental protection and flexible power generation methods,microgirds for combining distributed generation are receiving more and more attention.On the one hand,theoretical results of microgrid research need to be verified by experiments.The structure and algorithm of the existing microgrid demonstration project are fixed and difficult to adjust,which cannot meet the needs of experiments.Compared with the demonstration project of microgrid,microgrid experimental platform is more universal in theoretical verification.On the other hand,ensuring the stable operation of microgrid under time-varying structure is a very practical issue,too.This paper mainly focuses on the above issues and completes the following three aspects of work:(1)Converter digital controllers based on embedded TCP/IP protocol stack is designed,which integrates real-time communication,control,drive and other functions,and can realize complex converter control algorithm by programming.The hardware and software of the digital controller are designed by modularization,which has advantages of convenient testing and replacement.Finally,the effectiveness of Ethernet TCP/IP communication is verified by experiments.(2)Based on passivity theory and KYP lemma,a method of interface passivation of DC/DC converter with droop control is proposed.Combined with buck converter,the detailed design steps are analyzed,and the conditions for control parameters are deduced.After the simulation and hardware-in-the-loop simulation experiments,it is implemented on the converter digital controller.(3)The hardware experiment platform of AC and DC microg)rid with flexible and adjustable structure and programmable full platform controller is designed and built.A number of experiments have been carried out to verify the effectiveness of microgrid experimental platform.